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参考UL62中的定义:% f) i- ?0 {( p) Z- v7 @$ B
Not-for-hard-usage cord – a cord intended for use with light equipment, classified as the lowest grade% R7 B/ Q I4 ?3 B3 e9 L2 f% K
in mechanical serviceability.
: Z- v! z" ]& ?' qHard-usage cord – a cord intended for use with moderately heavy equipment and for hand-held
! m- ~9 E) S: T P4 L6 ?appliances and tools, classified as the medium grade in mechanical serviceability.. \3 G0 v/ w7 d6 L
Extra-hard-usage cord – a cord intended for use with heavy equipment and for hand-held appliances* G% q7 O# |0 x' @& B3 h1 u
and tools, classified as the highest grade in mechanical serviceability. |
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